diff --git a/CMakeLists.txt b/CMakeLists.txt
index e59535788..d7cedeef9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -319,4 +319,3 @@ if (ALLOW_CROSS_COMPILED_TESTS OR NOT CMAKE_CROSSCOMPILING)
 endif()
 
 include(CPackConfig)
-
diff --git a/cmake/AwsCRuntime.cmake b/cmake/AwsCRuntime.cmake
index 97dfdbbff..9590a17cb 100644
--- a/cmake/AwsCRuntime.cmake
+++ b/cmake/AwsCRuntime.cmake
@@ -18,7 +18,6 @@ function(aws_determine_local_c_runtime target)
         if (NOT(${AWS_MUSL_INDEX} EQUAL -1))
             message(STATUS "MUSL libc detected")
             set(${target} "musl" PARENT_SCOPE)
-            add_definitions(-DAWS_C_RUNTIME_MUSL)
         else()
             if ((NOT(${AWS_GLIBC_INDEX} EQUAL -1)) OR (NOT(${AWS_GNU_INDEX} EQUAL -1)))
                 message(STATUS "Gnu libc detected")
@@ -26,7 +25,6 @@ function(aws_determine_local_c_runtime target)
                 message(STATUS "Could not determine C runtime, defaulting to gnu libc")
             endif()
             set(${target} "glibc" PARENT_SCOPE)
-            add_definitions(-DAWS_C_RUNTIME_GLIBC)
         endif()
     else()
         set(${target} "cruntime" PARENT_SCOPE)